Simulating the helicopter-ship interface as an alternative to current methods of determining the safe operating envelopes
By: by J. Val Healey
Contributors: Naval Postgraduate School (U.S.). Dept. of Engineering
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1986
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 74
Subjects: HELICOPTERS; AIR FLOW; COMPUTERIZED SIMULATION; AIRCRAFT LANDINGS; FLUIDS; SHIP MOTION
Other titles: NPS-67-86-003.
Description: In the past decade, there has been a dramatic increase in the use of helicopters in conjunction      with non-aviation ships by the U.S. Navy. Landing the helicopter on the ship in the presence      of high winds and stormy seas can be a hazardous process. The safe operating envelopes are      determined at sea by the Naval Air Test Center and is a slow laborious and expensive      process. Moreover, there is a substantial backlog of about eleven helicopters and twenty ships      that, at the present rate, cannot be cleared in this century. This has led to the suggestion that      the problem might be solved by simulation, and it is with this suggestion that the present paper      is concerned. (1) The airflow to the ship can be predicted sufficiently accurately, (2) A good      basic ship motion prediction exists, but requires some further development and validation with      real ships, (3) The ship airwake is almost unknown and previous attempts to analyze it were      faulty, (4) Further work is required on turbulence modeling of helicopters, and (5) Before it is      possible to determine the size of computer necessary for simulation it is necessary to determine      the extent to which the mathematical model of the helicopter and the physical model of the      complex fluid flowfield can be simplified, while still retaining the fidelity of the helicopter      motion.
Notes: Title from cover.

"NPS-67-86-003."

"September 1986."

AD A175 911.

Includes bibliographical references (p. 61-71).

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